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Thread: K&N Air Filters
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Old 01-28-2013, 06:54 PM
ard ard is online now
Resident Curmudgeon
Location: Sierra foothills, California USA
Join Date: Jul 2009
Posts: 15,891
Mein Auto: '12 X5 35d/E39M5/996TTX50
Good inputs here. "Air filter upgrades" are all pretty much scams.

But a perfect money maker at that.... just look at all the companies vying for your $$$.

Here is some real data on K&N:

Unfortunately for the "My brother swears by it crowd" it likely requires WAY too much critical thinking....
Keep it as simple as possible...but no simpler.
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